Corpse desecration is a religious taboo not a natural one.
Look at the Buddhist monks in parts of tibet. After having readings done from the book of the dead to help speed the soul along. They believe the body is just a useless bag of meat and dispose of it as such.
"At one point two of the attendants unwrapped one of the bodies and calmly began to cut it up. At first they sliced of pieced of flesh which they tossed to an area about fifteen or twenty feet from where they were working. A couple of huge vultures were flying high overhead, and a couple of others were perched on some rocks at some distance. Then the men began to wave their arms and made some strange haunting sounds that reminded me of wild animal or bird calls. It probably took about 15-20 minutes for the birds to come - a few dozen. In the meantime the two men charged with the job of disposing of the bodies, continued to cut up the bodies, one at-a-time. The bones were hacked or broken into smaller pieces and tossed aside. The vultures swooped down and tore off pieces of flesh or in some cases flew off with a large chunk which they could eat without being challenged. The bigger bones were broken up on the rocks with large heavy stone, and the pieces tossed easily into the feeding area. Although there seemed to be more than enough for all the birds, by nature they kept vying for the spoils. The whole affair was not harried, but rather a methodical solemn process that must have lasted for a little more than an hour. "
-fibber
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